feat(charts): deterministic postgres secrets, sealed in host cluster #1075
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Currently, postgres secrets are randomized at helm install time. This is secure, however, can lead to problems recovering in cases where the cluster experiences unplanned down time. For example, see the incident report at:
https://dlsltd.sharepoint.com/:w:/s/Workflows/IQAeKijFhDqOT4adurvgibS4AVgjeK0bgzZstcE1tmf5T-A?e=3l6NGx
This PR replaces the randomized passwords with static SealedSecrets.